21144101545 has 32 divisors (see below), whose sum is σ = 29419545600. Its totient is φ = 14288541696.

The previous prime is 21144101533. The next prime is 21144101567. The reversal of 21144101545 is 54510144112.

It is a cyclic number.

It is not a de Polignac number, because 21144101545 - 2¹³ = 21144093353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1533241 + ... + 1546969.

It is an arithmetic number, because the mean of its divisors is an integer number (919360800).

Almost surely, 2^21144101545 is an apocalyptic number.

It is an amenable number.

21144101545 is a deficient number, since it is larger than the sum of its proper divisors (8275444055).

21144101545 is a wasteful number, since it uses less digits than its factorization.

21144101545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14377.

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 21144101545 its reverse (54510144112), we get a palindrome (75654245657).

The spelling of 21144101545 in words is "twenty-one billion, one hundred forty-four million, one hundred one thousand, five hundred forty-five".